By David Morgan WASHINGTON (Reuters) – The Republican head of a key U.S. House of Representatives committee said on Monday that he will pursue bipartisan legislation to better ensure the proper handling of classified documents at the White House when administrations leave office. House Oversight Committee Chairman James Comer said it is essential to have legislation ensuring classified material is not transferred from the offices of the president and vice president to unsecured locations at the end of an administration. The discovery of classified documents at former President Donald Trump’s M…